diff --git a/[refs] b/[refs]
index 7c4c5fded460..550a56830f87 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e078ba14dff5c315ce19a978574883f417d2cfa0
+refs/heads/master: cb1a28a0cbf9dac5a7a0ca02ebebc12db260d2f8
diff --git a/trunk/tools/perf/util/string.c b/trunk/tools/perf/util/string.c
index d5836382ff2c..199bc4d8905d 100644
--- a/trunk/tools/perf/util/string.c
+++ b/trunk/tools/perf/util/string.c
@@ -313,3 +313,25 @@ int strtailcmp(const char *s1, const char *s2)
 	return 0;
 }
 
+/**
+ * rtrim - Removes trailing whitespace from @s.
+ * @s: The string to be stripped.
+ *
+ * Note that the first trailing whitespace is replaced with a %NUL-terminator
+ * in the given string @s. Returns @s.
+ */
+char *rtrim(char *s)
+{
+	size_t size = strlen(s);
+	char *end;
+
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	return s;
+}
diff --git a/trunk/tools/perf/util/util.h b/trunk/tools/perf/util/util.h
index 2daaedb83d84..b13c7331eaf8 100644
--- a/trunk/tools/perf/util/util.h
+++ b/trunk/tools/perf/util/util.h
@@ -264,4 +264,6 @@ bool is_power_of_2(unsigned long n)
 
 size_t hex_width(u64 v);
 
+char *rtrim(char *s);
+
 #endif